As explained in the first article, OPE (Overall Process Effectiveness) is an important tool applied within the scope of Six Sigma.
In ARIS Six Sigma, the OPE can be calculated in the following ways:
- By using the 'Timeline' macro if you want to obtain only a rough calculation of KPIs
- By using a report if you want to obtain a more detailed calculation of KPIs
- By using the OPE rule set if you want to obtain an exact calculation
Below you will find some more information on how to calculate KPIs via macro or report:
Using the 'Timeline' macro
To calculate KPIs by means of the 'Timeline' macro you need a model of the 'Value stream map' type. A calculation can be performed only if the exact percentage of the performance, availability, and quality rates are specified per process step. Running the 'Timeline' macro will calculate and enter the OPE based on these rates.
This OPE calculation method is especially useful if you want to represent all KPIs of a Six Sigma-based process in one single model.
Using the 'Collect overall process effectiveness data' and 'Import overall process effectiveness data' reports
Just like the 'Timeline' macro, the 'Collect overall process effectiveness data' report is run from a model of the 'Value stream map' type. This report lists all functions of the model and outputs them to an Excel sheet.
If you specify the required KPIs in the Excel sheet and then import the sheet into the relevant model using the 'Import overall process effectiveness data' report, the OPE will be calculated and entered in the OPE attribute of the relevant process step.
Using the OPE rule set
Information on how to obtain an exact calculation of KPIs by using the OPE rule set will be provided in my next article.
